Update references to the extension messaging APIs to point to the "runtime"

chrome/common/extensions/docs/server2/link_converter.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script converts old-style <a> links to API docs to the new $ref links.
 # See reference_resolver.py for more info on the format of $ref links.
 
 import optparse
 import os
@@ skipping 42 matching lines @@
     return '%s$ref:%s%s' % (padding, page, link)
   else:
     return '%s$ref:[%s%s %s]' % (padding, page, link, title)
 
 def _ConvertFile(filename, use_stdout):
   regex = re.compile(r'<a(.*?)href=(.*?)>(.*?)</a>', flags=re.DOTALL)
   contents = _ReadFile(filename)
   contents  = re.sub(regex,
                      lambda m: _Replace(m, filename),
                      contents)
-  contents = contents.replace('$ref:extension.lastError',
+  contents = contents.replace('$ref:runtime.lastError',
                               '$ref:runtime.lastError')
   if use_stdout:
     print contents
   else:
     _WriteFile(filename, contents)
 
 if __name__ == '__main__':
   parser = optparse.OptionParser(
       description='Converts <a> links to $ref links.',
       usage='usage: %prog [option] <directory>')
   parser.add_option('-f', '--file', default='',
       help='Convert links in single file.')
   parser.add_option('-o', '--out', action='store_true', default=False,
       help='Write to stdout.')
   regex = re.compile(r'<a(.*?)href=(.*?)>(.*?)</a>', flags=re.DOTALL)
 
   opts, argv = parser.parse_args()
   if opts.file:
     _ConvertFile(opts.file, opts.out)
   else:
     if len(argv) != 1:
       parser.print_usage()
       exit(0)
     for root, dirs, files in os.walk(argv[0]):
       for name in files:
         _ConvertFile(os.path.join(root, name), opts.out)